为什么当xact_abort打开时，Sql Server在raiserror之后仍继续执行？

raiserror('Something bad happened', 16, 1);

IF @somethingBadHappened
    BEGIN;
        raiserror('Something bad happened', 16, 1);
        RETURN;
    END;

-- first lets build a temporary table to hold errors
IF (object_id('tempdb..#RAISERRORS') IS NULL)
 CREATE TABLE #RAISERRORS (ErrorNumber INT, ErrorMessage VARCHAR(400), ErrorSeverity INT, ErrorState INT, ErrorLine INT, ErrorProcedure VARCHAR(128));

-- this will determine if the transaction level of the query to programatically determine if we need to begin a new transaction or create a save point to rollback to
DECLARE @tc AS INT;
SET @tc = @@trancount;
IF (@tc = 0)
 BEGIN TRANSACTION;
ELSE
 save TRANSACTION myTransaction;

-- the code in the try block will be executed
BEGIN try
 DECLARE @return_value = '0';
 SET @return_value = '0';
 DECLARE
  @ErrorNumber AS INT,
  @ErrorMessage AS VARCHAR(400),
  @ErrorSeverity AS INT,
  @ErrorState AS INT,
  @ErrorLine AS INT,
  @ErrorProcedure AS VARCHAR(128);


 -- assume that this procedure fails...
 EXEC @return_value = [dbo].[AssumeThisFails]
 IF (@return_value <> 0)
  raiserror('This is my error message', 17, 1);

 -- the error severity of 17 will be considered a system error execution of this query will skip the following statements and resume at the begin catch block
 IF (@tc = 0)
  commit TRANSACTION;
 RETURN(0);
END try


-- the code in the catch block will be executed on raiserror("message", 17, 1)
BEGIN catch
  SELECT
   @ErrorNumber = ERROR_NUMBER(),
   @ErrorMessage = ERROR_MESSAGE(),
   @ErrorSeverity = ERROR_SEVERITY(),
   @ErrorState = ERROR_STATE(),
   @ErrorLine = ERROR_LINE(),
   @ErrorProcedure = ERROR_PROCEDURE();

  INSERT #RAISERRORS (ErrorNumber, ErrorMessage, ErrorSeverity, ErrorState, ErrorLine, ErrorProcedure)
   VALUES (@ErrorNumber, @ErrorMessage, @ErrorSeverity, @ErrorState, @ErrorLine, @ErrorProcedure);

  -- if i started the transaction
  IF (@tc = 0)
  BEGIN
   IF (XACT_STATE() <> 0)
   BEGIN
     SELECT * FROM #RAISERRORS;
    ROLLBACK TRANSACTION;
    INSERT INTO [dbo].[Errors] (ErrorNumber, ErrorMessage, ErrorSeverity, ErrorState, ErrorLine, ErrorProcedure)
     SELECT * FROM #RAISERRORS;
    INSERT [dbo].[Errors] (ErrorNumber, ErrorMessage, ErrorSeverity, ErrorState, ErrorLine, ErrorProcedure)
     VALUES (@ErrorNumber, @ErrorMessage, @ErrorSeverity, @ErrorState, @ErrorLine, @ErrorProcedure);
    RETURN(1);
   END
  END
  -- if i didn't start the transaction
  IF (XACT_STATE() = 1)
  BEGIN
   ROLLBACK TRANSACTION myTransaction;
   IF (object_id('tempdb..#RAISERRORS') IS NOT NULL)
    INSERT #RAISERRORS (ErrorNumber, ErrorMessage, ErrorSeverity, ErrorState, ErrorLine, ErrorProcedure)
     VALUES (@ErrorNumber, @ErrorMessage, @ErrorSeverity, @ErrorState, @ErrorLine, @ErrorProcedure);
   ELSE
    raiserror(@ErrorMessage, @ErrorSeverity, @ErrorState);
   RETURN(2);
  END
  ELSE IF (XACT_STATE() = -1)
  BEGIN
   ROLLBACK TRANSACTION;
   IF (object_id('tempdb..#RAISERRORS') IS NOT NULL)
    INSERT #RAISERRORS (ErrorNumber, ErrorMessage, ErrorSeverity, ErrorState, ErrorLine, ErrorProcedure)
     VALUES (@ErrorNumber, @ErrorMessage, @ErrorSeverity, @ErrorState, @ErrorLine, @ErrorProcedure);
   ELSE
    raiserror(@ErrorMessage, @ErrorSeverity, @ErrorState);
   RETURN(3);
  END
 END catch
END